/*
 * ==========================================================================================
 * =                   JAHIA'S DUAL LICENSING - IMPORTANT INFORMATION                       =
 * ==========================================================================================
 *
 *                                 http://www.jahia.com
 *
 *     Copyright (C) 2002-2025 Jahia Solutions Group SA. All rights reserved.
 *
 *     THIS FILE IS AVAILABLE UNDER TWO DIFFERENT LICENSES:
 *     1/Apache2 OR 2/JSEL
 *
 *     1/ Apache2
 *     ==================================================================================
 *
 *     Copyright (C) 2002-2025 Jahia Solutions Group SA. All rights reserved.
 *
 *     Licensed under the Apache License, Version 2.0 (the "License");
 *     you may not use this file except in compliance with the License.
 *     You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *     Unless required by applicable law or agreed to in writing, software
 *     distributed under the License is distributed on an "AS IS" BASIS,
 *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *     See the License for the specific language governing permissions and
 *     limitations under the License.
 *
 *
 *     2/ JSEL - Commercial and Supported Versions of the program
 *     ===================================================================================
 *
 *     IF YOU DECIDE TO CHOOSE THE JSEL LICENSE, YOU MUST COMPLY WITH THE FOLLOWING TERMS:
 *
 *     Alternatively, commercial and supported versions of the program - also known as
 *     Enterprise Distributions - must be used in accordance with the terms and conditions
 *     contained in a separate written agreement between you and Jahia Solutions Group SA.
 *
 *     If you are unsure which license is appropriate for your use,
 *     please contact the sales department at sales@jahia.com.
 */
package org.apache.jackrabbit.core.query;

import org.apache.jackrabbit.core.query.lucene.join.SimpleQueryResult;

import javax.jcr.RepositoryException;
import javax.jcr.query.Row;
import javax.jcr.query.RowIterator;
import java.util.ArrayList;
import java.util.List;
import java.util.NoSuchElementException;

/**
 * Simple query result implementation.
 */
public class JahiaSimpleQueryResult extends SimpleQueryResult {

    private final RowIterator rowIterator;
    private final List<Row> rows = new ArrayList<>();
    private final long approxCount;

    public JahiaSimpleQueryResult(String[] columnNames, String[] selectorNames, RowIterator rowIterator) {
        this(columnNames, selectorNames, rowIterator, 0);
    }

    public JahiaSimpleQueryResult(String[] columnNames, String[] selectorNames, RowIterator rowIterator, long approxCount) {
        super(columnNames, selectorNames, rowIterator);
        this.rowIterator = rowIterator;
        this.approxCount = approxCount;
    }

    @Override
    public RowIterator getRows() throws RepositoryException {
        return new Iterator();
    }

    private class Iterator implements RowIterator {
        private int position = 0;

        public Row nextRow() {
            if (position < rows.size()) {
                return rows.get(position++);
            }
            if (rowIterator.hasNext()) {
                rows.add(rowIterator.nextRow());
                return rows.get(position++);
            }
            throw new NoSuchElementException();
        }

        public void skip(long skipNum) {
            for (int i = 0; i < skipNum; i++) {
                nextRow();
            }
        }

        public long getSize() {
            return rowIterator.getSize();
        }

        public long getPosition() {
            return position;
        }

        public boolean hasNext() {
            return position < rows.size() || rowIterator.hasNext();
        }

        public Object next() {
            return nextRow();
        }

        @Override
        public void remove() {
            throw new UnsupportedOperationException();
        }
    }

    public long getApproxCount() {
        return approxCount;
    }

}
